Latest Infosys Aptitude Question SOLUTION: Q. There are 6 boll in bag out of them 4 green and 2 red, randomly picked two boll one by one so find the probabilty atleast one picked boll will be red?

• Placement Papers
• /
• Infosys
• /
• Numerical Ability
• /
• Permutation and Combination

Infosys Question Papers: Infosys Interview Experience(10) INFOSYS Company Profile

(#M40031909) INFOSYS Numerical Ability question Keep an EYE

Q. There are 6 boll in bag out of them 4 green and 2 red, randomly picked two boll one by one so find the probabilty atleast one picked boll will be red?

Asked In Infosys Shilpi Jain (11 years ago)

Solved mohan lal garg Read Solution (10)

Is this Puzzle helpful?   (3)   (4) Submit Your Solution Permutation and Combination

Read Solution (10) :

LALIT AGRAWAL  (11 years ago)

probality of selecting 1 red + probality of selecting 2 red =((2c1*4c1)/6c2)+((2c2)/(6c2))=3/5

Is this solution Helpfull? Yes (34) | No (2)  

mohan lal garg  (11 years ago)

PROBABILITY=1-BOTH TIME GREEN BALL
1 TIME GREEN BALL=4/6(4 OUT OF 5)
2 TME GREEN BALL=3/5(3 OUT OF 5)
1-(4/6*3/5)
=1-2/5=3/5

ANS=3/5

Is this solution Helpfull? Yes (27) | No (2)  

DHAKAD NEETENDRA SINGH  (11 years ago)

6 balls 4 green and 2 red
there are three cases in this question
I. first ball is red and second is not red
prob for this= (2/6)*(4/5)
II. first ball is not red but second ball is red
prob for this= (4/6)*(2/5)
III. if both the balls are red
prob for this= (2/6)*(1/5)
now,
required prob= prob(I+II+III)
= (4/15)*(4/15)*(1/15)
= 3/5 ans....

Is this solution Helpfull? Yes (11) | No   

Subhajit Saha  (10 years ago)

probability of no boll will red become
4c2/6c2=2/5
so probability of at list one is red is
1-2/5=3/5

Is this solution Helpfull? Yes (5) | No   

Sonu Kumar Sharma  (11 years ago)

(4c1*2c1+4c0*2c2)/6c2 = 9/15

Is this solution Helpfull? Yes (2) | No (2)  

Ranjith Kumar S  (10 years ago)

2C1*4C1+2C2/6C2=3/5

Is this solution Helpfull? Yes (2) | No   

praveen prakash  (10 years ago)

2(4/6*2/5)+(2/6*1/5)=3/5

Is this solution Helpfull? Yes (1) | No   

Sireesha  (11 years ago)

1/15 2C2 / 6C2 = 1/15

Is this solution Helpfull? Yes | No (7)  

vikash kumar  (10 years ago)

1st ballis red 2nd ball maybe of any colour so an

ans =(2c1*5c1)/6c2=2/3

Is this solution Helpfull? Yes | No   

Ankikia  (10 years ago)

Thare are 2 cases... 1. one of the picked balls is red,other is green 2.two of the picked ball is red,other is none.
so according to both
((2c1*4c1)+(2c2*4c0))/6c2
=3/5

Is this solution Helpfull? Yes | No   

Please Login to Read Solution.